:root {
    --primary: #22d3bd;
    --primary-glow: rgba(34, 211, 189, 0.4);
    --bg-dark: #09111f;
    --card-bg: rgba(15, 27, 45, 0.8);
    --text-main: #f8fafc;
    --text-muted: #a8b3c7;
}

.premium-tool {
    background-color: var(--bg-dark);
    color: var(--text-main);
}

.hero-premium {
    position: relative;
    padding: 80px 20px;
    text-align: center;
    overflow: hidden;
}

.hero-premium h1 {
    font-size: 3.5rem;
    font-weight: 800;
    background: linear-gradient(135deg, #fff 0%, var(--primary) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    margin-bottom: 20px;
}

.glow {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: 300px;
    height: 300px;
    background: var(--primary-glow);
    filter: blur(120px);
    z-index: -1;
}

.card-glass {
    background: var(--card-bg);
    backdrop-filter: blur(12px);
    border: 1px solid rgba(255, 255, 255, 0.1);
    border-radius: 24px;
    padding: 40px;
    margin: 40px 0;
}

.btn-premium {
    display: inline-block;
    background: var(--primary);
    color: var(--bg-dark);
    padding: 16px 32px;
    border-radius: 12px;
    font-weight: 700;
    text-decoration: none;
    transition: all 0.3s ease;
    box-shadow: 0 4px 15px var(--primary-glow);
}

.btn-premium:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 25px var(--primary-glow);
}

.loading {
    text-align: center;
    padding: 40px;
    color: var(--text-muted);
    font-style: italic;
}

/* ========== Calculator UI ========== */
.calculator-form {
    color: var(--text-main);
}

.calculator-form h3,
.calculator-form h4,
.calculator-form h5 {
    color: var(--primary);
    margin: 0 0 16px;
    font-weight: 700;
}

.calculator-form h3 { font-size: 1.5rem; }
.calculator-form h4 { font-size: 1.15rem; margin-top: 20px; }
.calculator-form h5 { font-size: 1rem; margin-top: 16px; }

.calculator-form p {
    color: var(--text-main);
    margin: 8px 0;
    line-height: 1.6;
}

.input-group {
    margin-bottom: 18px;
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.input-group label {
    font-weight: 600;
    font-size: 0.95rem;
    color: var(--text-muted);
}

.input-group input,
.input-group select,
.input-group textarea {
    width: 100%;
    padding: 12px 14px;
    background: rgba(9, 17, 31, 0.6);
    border: 1px solid rgba(255, 255, 255, 0.15);
    border-radius: 10px;
    color: var(--text-main);
    font-family: inherit;
    font-size: 1rem;
    box-sizing: border-box;
    transition: border-color 0.2s, box-shadow 0.2s;
}

.input-group input:focus,
.input-group select:focus,
.input-group textarea:focus {
    outline: none;
    border-color: var(--primary);
    box-shadow: 0 0 0 3px var(--primary-glow);
}

.input-group select option {
    background: var(--bg-dark);
    color: var(--text-main);
}

/* Buttons */
.btn-calculate,
.btn-secondary,
.btn-danger {
    display: inline-block;
    padding: 12px 22px;
    border: none;
    border-radius: 10px;
    font-family: inherit;
    font-weight: 700;
    font-size: 0.95rem;
    cursor: pointer;
    margin: 8px 8px 8px 0;
    transition: transform 0.2s, box-shadow 0.2s, opacity 0.2s;
}

.btn-calculate {
    background: var(--primary);
    color: var(--bg-dark);
    box-shadow: 0 4px 14px var(--primary-glow);
}

.btn-calculate:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px var(--primary-glow);
}

.btn-secondary {
    background: transparent;
    color: var(--primary);
    border: 1px solid var(--primary);
}

.btn-secondary:hover {
    background: rgba(34, 211, 189, 0.1);
}

.btn-danger {
    background: rgba(239, 68, 68, 0.15);
    color: #f87171;
    border: 1px solid rgba(239, 68, 68, 0.3);
}

.btn-danger:hover {
    background: rgba(239, 68, 68, 0.25);
}

/* Result boxes */
.result-box {
    margin-top: 24px;
    padding: 24px;
    background: rgba(34, 211, 189, 0.08);
    border: 1px solid rgba(34, 211, 189, 0.25);
    border-radius: 14px;
    color: var(--text-main);
}

.result-box h4,
.result-box h5 {
    color: var(--primary);
    margin-top: 0;
}

.result-box p {
    margin: 6px 0;
    color: var(--text-main);
}

.result-box strong {
    color: var(--primary);
}

/* Expense / list items */
.expense-item,
.split-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 10px 14px;
    margin: 6px 0;
    background: rgba(255, 255, 255, 0.04);
    border: 1px solid rgba(255, 255, 255, 0.08);
    border-radius: 8px;
    color: var(--text-main);
}

.expense-item button {
    background: transparent;
    border: 0;
    cursor: pointer;
    color: #f87171;
}

.total-split {
    margin-top: 16px;
    padding-top: 12px;
    border-top: 1px dashed rgba(255, 255, 255, 0.15);
    font-weight: 700;
    color: var(--primary);
}

/* Alerts and status */
.alert,
.success {
    padding: 12px 16px;
    border-radius: 10px;
    margin: 12px 0;
    font-weight: 600;
}

.alert {
    background: rgba(239, 68, 68, 0.12);
    border: 1px solid rgba(239, 68, 68, 0.3);
    color: #fca5a5;
}

.success {
    background: rgba(34, 211, 189, 0.12);
    border: 1px solid rgba(34, 211, 189, 0.3);
    color: var(--primary);
}

/* Strategy / comparison */
.strategy-box {
    padding: 16px;
    margin: 12px 0;
    background: rgba(255, 255, 255, 0.04);
    border-left: 3px solid var(--primary);
    border-radius: 8px;
    color: var(--text-main);
}

.comparison-table {
    width: 100%;
    border-collapse: collapse;
    margin: 16px 0;
    color: var(--text-main);
}

.comparison-table th,
.comparison-table td {
    padding: 10px 12px;
    text-align: left;
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
}

.comparison-table th {
    background: rgba(34, 211, 189, 0.1);
    color: var(--primary);
    font-weight: 700;
}

/* Progress bars */
.progress-bar {
    width: 100%;
    height: 10px;
    background: rgba(255, 255, 255, 0.08);
    border-radius: 999px;
    overflow: hidden;
    margin: 8px 0 16px;
}

.progress-fill {
    height: 100%;
    background: linear-gradient(90deg, var(--primary), #4ade80);
    border-radius: 999px;
    transition: width 0.4s ease;
}

/* Content / EEAT sections */
.content-eeat {
    margin-top: 40px;
}

.content-eeat .article-content h2 {
    color: var(--primary);
    font-size: 2rem;
    margin-bottom: 16px;
}

.content-eeat .article-content p {
    color: var(--text-main);
    line-height: 1.7;
    margin-bottom: 14px;
}

.cta-premium {
    text-align: center;
}

.cta-premium h3 {
    font-size: 1.6rem;
    color: var(--primary);
    margin: 0 0 12px;
}

.cta-premium p {
    color: var(--text-muted);
    margin-bottom: 20px;
}

/* Header / nav */
.premium-tool > header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 20px 32px;
    border-bottom: 1px solid rgba(255, 255, 255, 0.08);
}

.premium-tool .logo {
    font-weight: 800;
    letter-spacing: 1px;
    color: var(--primary);
}

.premium-tool nav a {
    color: var(--text-main);
    text-decoration: none;
    margin-left: 24px;
    font-weight: 600;
    transition: color 0.2s;
}

.premium-tool nav a:hover {
    color: var(--primary);
}

/* Responsive */
@media (max-width: 640px) {
    .hero-premium h1 { font-size: 2.2rem; }
    .card-glass { padding: 24px; border-radius: 16px; }
    .premium-tool > header { flex-direction: column; gap: 12px; padding: 16px; }
    .premium-tool nav a { margin: 0 12px; }
    .btn-calculate, .btn-secondary, .btn-danger { width: 100%; margin: 6px 0; }
    .expense-item, .split-item { flex-direction: column; align-items: flex-start; gap: 4px; }
}